用户指南和参考

ST_AsText

db2gse.ST_AsText takes a geometry object and returns its well-known text representation.

语法

db2gse.ST_AsText(g db2gse.ST_Geometry)

返回类型

Varchar(4000)

示例

在以下方案中,db2gse.ST_AsText 函数将 HAZARDOUS_SITES 位置点转换成它的文本说明:

CREATE TABLE HAZARDOUS_SITES (site_id   integer,
                              name      varchar(40),
                              location  db2gse.ST_Point);
INSERT INTO HAZARDOUS_SITES
VALUES (102,
        'W. H. Kleenare Chemical Repository',
        db2gse.ST_PointFromText('point (1020.12 324.02)', db2gse.coordref()..srid(0)));
 
SELECT site_id, name, cast(db2gse.ST_AsText(location) as varchar(40)) "Location"
FROM HAZARDOUS_SITES;

SELECT 语句返回以下结果集:

SITE_ID Name                                 Location
------- ------------------------------------ ----------------------------------------
    102 W. H. Kleenare Chemical Repository   POINT (1020.00000000 324.00000000)


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